All-plastic pressing pump
By forming convex ribs on the inner sleeve of the full-plastic pressing pump and cooperating with the outer sleeve of the brace, the problem of insufficient sealing of the neck when the pressure head is not fully reset is solved, and the effect of preventing water inlet and leaks is achieved. .
Patent Information
- Application Number
- CN202411558975.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-02-07
AI Technical Summary
The existing all-plastic press pump cannot seal the neck when the pressure head is not fully reset to its stroke upper dead center, resulting in problems such as water inlet and leakage prevention.
A fully plastic press pump is designed, which includes an elastic reset mechanism made of plastic. By forming a convex rib on the inner sleeve and cooperating with the outer sleeve of the brace, a sealing fit is formed to ensure that the indenter is not fully reset. The sealing of the neck is still possible.
Effectively prevent water from entering the pressing pump and prevent product leakage, ensuring that the pressing pump remains sealed when it is not fully reset.
Smart Images
Figure CN119387068A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of product dispensing devices, and in particular to an all-plastic press pump. Background Art
[0002] Press pumps are widely used in packaging containers of daily chemical products such as shower gel and shampoo to dispense products from the container for consumers to use.
[0003] In conventional pumps, metal springs are used as elastic reset mechanisms. When the pressure head of the pump is at the top dead center of its stroke, the upper edge of the piston can be pressed against the cylinder head or the top of the cylinder by the elastic force of the metal spring, thereby sealing the neck of the pump. At the same time, the metal spring can also press the piston downward against the piston head, thereby sealing the upper check valve of the pump. In this way, the elastic force of the metal spring can achieve a good seal on the pressure nozzle and neck of the pump head, which helps prevent product leakage when the pump is in the upper standby position.
[0004] At present, in order to meet the increasing environmental protection requirements, all-plastic pumps are promoted. In the all-plastic pump, a plastic elastic reset mechanism is used to replace the metal spring. However, the elasticity of the elastic reset mechanism made of plastic is weaker than that of the metal spring, and due to the characteristics of the plastic material itself, the elasticity of the plastic elastic mechanism will gradually decay with the increase in the number of uses, resulting in the inability to completely return the pressure head of the press pump to its upper dead center after use. The failure of the pressure head of the press pump to completely reset further leads to the failure of the neck of the press pump and the pressure head pressure nozzle to be completely sealed. The unsealed neck of the press pump will cause water to enter the container from the neck of the press pump during a shower, thereby causing contamination of the product in the container. Alternatively, if the container equipped with the press pump is turned over or laid flat, the product in the container or in the cylinder of the press pump will leak out through the unsealed neck of the press pump.
[0005] Therefore, in the art, there is a need for further improvement of the pressing pump to solve the problem of preventing water ingress and leakage when the pressure head of the pressing pump is not completely reset to the top dead point of its stroke. Summary of the invention
[0006] The present application is made to solve the problems existing in the prior art mentioned above. The purpose of the present application is to provide a press pump with improved structure, which includes an elastic reset mechanism made of plastic, which can still achieve the sealing of the neck of the press pump when the pressure head of the press pump fails to fully return to its upper dead point of travel.
[0007] The present application proposes an all-plastic press pump, which includes a movable part, a fixed part and an elastic reset mechanism. The movable part can reciprocate along the axial direction of the all-plastic press pump relative to the fixed part. The elastic reset mechanism is made of plastic material and supported between the movable part and the fixed part. The movable part includes a pressure head, and an inner sleeve is formed below the pressure head. The fixed part includes a brace, and an outer sleeve is formed on the upper part of the brace, and the inner sleeve can be fitted into the outer sleeve. A convex rib is formed on the inner sleeve, and the outer diameter of the convex rib is larger than the inner diameter of the outer sleeve, and is also larger than the outer diameter of other parts of the inner sleeve except the convex rib. The convex rib is arranged to form a sealing fit between the inner surface of the outer sleeve of the brace and the outer surface of the convex rib when the pressure head is reset to the upper dead point of the stroke and when the pressure head is not completely reset to the upper dead point of the stroke.
[0008] In the above-mentioned all-plastic press pump, even when the pressure head is not completely reset to its upper dead point, the outer sleeve of the braces can fit with the ribs on the inner sleeve without any gap, thereby ensuring that a seal is formed between the pressure head and the braces, preventing water from entering the press pump and preventing product leakage.
[0009] In a specific structure, the rib is formed at the lower end of the inner sleeve.
[0010] More specifically, in the axial direction of the all-plastic compression pump, the length of the convex rib is greater than the length of the contact portion between the outer sleeve and the convex rib. The greater length of the convex rib helps to ensure that the inner sleeve of the pressure head and the outer sleeve of the dental brace can still achieve a sealed fit when the pressure head is not fully reset.
[0011] Preferably, a vertical face is formed on one of the outer surface of the rib and the inner surface of the outer sleeve. For example, in one embodiment, a vertical face can be formed on the outer surface of the rib. Of course, the situation where the vertical face is formed on the outer sleeve is also within the scope of the present application.
[0012] Preferably, a transition portion is provided between the convex rib and other parts of the inner sleeve, and the shape of the outer surface of the transition portion is one of the following shapes: an inclined surface, a curved surface, and a combination of an inclined surface and a curved surface. For example, the convex rib may include a vertical surface, and an inclined surface, especially a long inclined surface, is formed between the other parts of the inner sleeve and the convex rib to serve as a transition portion. The transition portion can guide the reset movement of the indenter relative to the brace toward the upper dead point of its travel to facilitate the return of the indenter to the upper dead point of its travel.
[0013] Preferably, the outer diameter of the inner sleeve except the ribs is smaller than the inner diameter of the inner sleeve. Thus, when the pressure head is pressed downward to allow the inner surface of the outer sleeve of the mouthpiece to pass over the ribs, a gap is formed between the pressure head and the mouthpiece to allow air to enter the pressing pump through the gap, thereby balancing the pressure inside and outside the container.
[0014] Specifically, the all-plastic compression pump further includes: a cylinder, which is fixedly connected to the toothed sleeve, and a balancing air hole is formed on the side wall of the cylinder; a piston rod, one end of which is connected to the pressure head, and a piston is arranged on the other end of the piston rod and extends into the cylinder, and the outer ring of the piston is sealed with the inner surface of the cylinder. The outer ring of the piston includes an upper sealing ring and a lower sealing ring, and the position of the balancing air hole is set so that when the pressure head is reset to the upper dead point of the stroke and when the pressure head is not completely reset to the upper dead point of the stroke, the balancing air hole is located between the upper sealing ring and the lower sealing ring.
[0015] Such a balancing air hole arrangement can prevent the product from leaking into the cylinder through the balancing air hole when the container is bumped or placed horizontally.
[0016] Specifically, the position of the balancing air hole is set so that when the pressure head is reset to the upper dead center of the stroke, the distance between the balancing air hole and the lower sealing ring is smaller than the distance between the balancing air hole and the upper sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings show non-limiting preferred implementation structures of the present invention, and the features and advantages of the present invention can be more clearly seen in conjunction with the accompanying drawings.
[0018] Figure 1 A schematic cross-sectional view of the pressing pump of the present application is shown, wherein the pressure head of the pressing pump is at the top dead center of its stroke.
[0019] Figure 2 Shows Figure 1 A cross-sectional view of the pressure head of the pressing pump.
[0020] Figure 3 Shows Figure 1 A cross-sectional view of the mouthpiece of a compression pump.
[0021] Figure 4 Shows Figure 1 A partial enlarged view of part I in FIG.
[0022] Figure 5 Another cross-sectional view of the pressing pump of the present application is shown, in which the pressure head of the pressing pump is in a state where it has not been completely reset to the top dead center of its stroke.
[0023] Figure 6 Shows Figure 5 A partial enlarged view of part III.
[0024] Figure 7 Another cross-sectional view of the pressing pump of the present application is shown, wherein the pressure head of the pressing pump is in the process of being pressed downward.
[0025] Figure 8 Shows Figure 7A partial enlarged view of part V in FIG. 1 , showing a gap between the inner sleeve of the indenter and the outer sleeve of the dental brace.
[0026] Fig. 9 Another cross-sectional view of the pressing pump of the present application is shown, wherein the pressure head of the pressing pump is at the bottom dead center of its stroke.
[0027] Fig.10 Shows Figure 1 A partial enlarged view of part II.
[0028] Fig.11 Shows Figure 5 A partial enlarged view of part IV.
[0029] (Explanation of symbols)
[0030] 1 Press the pump
[0031] 10 pressure head
[0032] 11Inner sleeve
[0033] 12 convex ribs
[0034] 13 Vertical Face
[0035] 14 bevel section
[0036] 20 braces
[0037] 21 Outer sleeve
[0038] 30 cylinders
[0039] 31 Cylinder head
[0040] 32 cylinder block
[0041] 33 Balanced pores
[0042] 40 Elastic reset mechanism
[0043] 50 piston rod
[0044] 51 Piston
[0045] 52 Upper sealing ring
[0046] 53 lower sealing ring DETAILED DESCRIPTION
[0047] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the drawings only show preferred embodiments of the present invention, which do not constitute a limitation on the scope of the present invention. Those skilled in the art can make various obvious modifications, variations, and equivalent substitutions to the present invention based on the embodiments shown in the drawings, and the technical features of the different embodiments described below can be arbitrarily combined with each other without contradiction, which all fall within the scope of protection of the present invention.
[0048] Figure 1 The schematic cross-sectional view of the structure of the pressing pump 1 of the present application is shown. The pressing pump 1 includes a pressing head 10 and a toothed brace 20, and the pressing head 10 and the toothed brace 20 can be matched together to move up and down relative to each other. Figure 1 In the figure, the pressing pump 1 is in a state where the pressure head 10 returns to the top dead center. The pressing pump 1 also includes a cylinder 30, which is fixedly connected to the mouthpiece 20.
[0049] In the exemplary structure shown in the figure, the cylinder 30 includes a cylinder head 31 and a cylinder body 32, the cylinder head 31 is fixed to the brace 20 by means such as snap-fitting, and the cylinder body 32 is connected to the bottom of the cylinder head 31. Alternatively, in other alternative structures, the cylinder 30 can be a single component formed integrally, which is fixedly connected to the brace 20 at the upper part, and this structure is also within the scope of the present application.
[0050] A piston rod 50 is connected or arranged on the inner side of the lower part of the toothed sleeve 20. One end of the piston rod 50 is connected to the toothed sleeve 20, and a piston 51 is arranged on the other end and extends into the inner space of the cylinder 30, and the piston 51 is sealed with the inner wall of the cylinder 30. Specifically, the piston 51 has an inner ring and an outer ring, and the outer ring is sealed with the inner wall of the cylinder 30.
[0051] The pressing pump 1 further comprises an elastic restoring mechanism 40, which is supported between the pressing head 10 as a movable part and the cylinder 30 as a fixed part. In the present application, the elastic restoring mechanism 40 is made of plastic material.
[0052] Figure 2 Shows Figure 1 Schematic structural cross-sectional view of a pressure head 10 of a pressing pump 1. An inner sleeve 11 is formed at the lower part of the pressure head 10, and a convex rib 12 is provided on the inner sleeve 11. In the structure shown in the figure, the convex rib 12 is formed at or near the lower end of the inner sleeve 11. And wherein, the outer diameter of the convex rib 12 is set to be larger than the outer diameter of the rest of the inner sleeve 11.
[0053] exist Figure 3 It is shown in Figure 1Schematic structural cross-sectional view of the mouthpiece 20 of the pressing pump 1. An outer sleeve 21 is formed on the upper part of the mouthpiece 20. The inner sleeve 11 of the pressure head 10 can extend into and fit in the outer sleeve 21.
[0054] Figure 4 It is shown in Figure 1 A partial enlarged view of part I. Figure 4 It can be more clearly seen in the figure that the rib 12 preferably includes a vertical surface 13, wherein when the ram 10 is at the top dead center position of its stroke, the inner surface of the outer sleeve 21 contacts the outer surface of the rib 12 on the inner sleeve 11. In addition, the inner diameter of the outer sleeve 21 is set to be slightly smaller than the outer diameter of the rib 12 of the inner sleeve 11, so that when the inner surface of the outer sleeve 21 contacts the outer surface of the rib 12 of the inner sleeve 11, an interference fit is formed therebetween, thereby forming a seal.
[0055] The axial length of the contact portion between the outer sleeve 21 and the convex rib 12 is smaller than the axial length of the convex rib 12, so that the sealing fit between the outer sleeve 21 and the convex rib 12 can always be maintained within a predetermined range of motion of the ram 10 relative to the dental brace 20 in the axial direction (i.e., the up and down direction in the figure). In this way, even if the ram 10 cannot completely return to its upper dead center due to insufficient elastic force of the elastic reset mechanism 40 made of plastic, a sealing fit can still be formed between the ram 10 and the dental brace 20 to prevent water from entering the press pump 1 and prevent the product from leaking to the outside from the gap between the ram 10 and the dental brace 20.
[0056] For example, in Figure 5 Another schematic cross-sectional view of the press pump 1 is shown in FIG. 1 , in which the pressure head 10 is shown as not returning to the position of the top dead center of its stroke, and Figure 6 It shows Figure 5 The enlarged view of the middle part III shows that when the ram 10 has not returned to its upper dead center, the inner surface of the outer sleeve 21 can still cooperate with the rib 12 on the inner sleeve 11.
[0057] Preferably, the outer diameter of the inner sleeve 11 except the rib 12 is smaller than the outer diameter of the rib 12, and is also smaller than the inner diameter of the outer sleeve 21. Figure 7 and 8 As shown, when the pressure head 10 is pressed downward so that the outer sleeve 21 of the mouthpiece 20 passes over the vertical surface 13 of the rib 12, a gap is formed between the outer sleeve 21 and the inner sleeve 11. The air outside the compression pump 1 can flow into the compression pump 1 through the gap to balance the pressure inside and outside the compression pump 1. The air flowing into the compression pump 1 from the outside through the gap is Figure 8 It is schematically indicated by arrow A.
[0058] When the pressure head 10 is pressed downwardly, Fig. 9 When reaching the lower dead point of its stroke as shown, a gap for air to pass is always maintained between the outer sleeve 21 and the rib 12.
[0059] Optionally, return to Figure 4 , which shows that a chamfer 14 is also provided on the outer surface of the inner sleeve 11 of the press head 10, and the chamfer 14 is connected between the rib 12 and other parts of the inner sleeve 11 to form a transition surface between the two. In the process of the press head 10 returning to its upper dead point, the chamfer 14 can guide the relative upward movement of the press head 10 relative to the toothed brace 20, thereby helping the press head 10 to return to the position of its upper dead point.
[0060] It should be noted here that the vertical surface 13 described above is not necessarily formed on the rib 12 of the inner sleeve 11, and it may also be formed on the inner surface of the outer sleeve 21 instead. In addition, the axial length of the vertical surface 13 formed on the inner surface of the outer sleeve 21 is greater than the axial length of the contact portion between the vertical surface 13 and the rib 12 of the inner sleeve 11.
[0061] like Fig.10 and 11 As shown more clearly in FIG. 1 , a balancing air hole 33 is formed on the side wall of the cylinder 30. For example, the balancing air hole 33 may be formed on the side wall of the cylinder body 32. The outer ring of the piston 51 includes an upper sealing ring 52 and a lower sealing ring 53, and the upper sealing ring 52 and the lower sealing ring 53 are sealed with the inner wall of the cylinder 30. Fig.10 As shown, the position of the balancing air hole 33 in the cylinder 30 is selected so that when the ram 10 is at the top dead center of its stroke, the balancing air hole 33 is located between the upper sealing ring 52 and the lower sealing ring 53 .
[0062] Furthermore, when the ram 10 is at its top dead center, the distance between the balancing air hole 33 and the lower sealing ring 53 is smaller than the distance between the balancing air hole 33 and the upper sealing ring 52, that is, the balancing air hole 33 is closer to the lower sealing ring 53. In this way, even when the ram 10 cannot be completely reset to the position of its top dead center, the cylinder 30 is still between the upper sealing ring 52 and the lower sealing ring 53. Fig.11 As shown in FIG. 1 , the product in the container can be prevented from entering the cylinder 30 of the pressing pump 1 through the balancing air hole 33 when the container is knocked over or placed horizontally.
[0063] The specific implementation structure of the present application is described in detail above in conjunction with the accompanying drawings. Those skilled in the art will appreciate that the structure shown in the drawings does not constitute a limitation to the present application, and other obvious modifications, variations and combinations can be made on the basis of the disclosed structure, and these are still within the scope of the present application.
[0064] For example, the cylinder 30 shown in the figure includes a cylinder head 31 and a cylinder block 32, but an integrally formed one-piece cylinder 30 is also within the scope of the present application.
[0065] The rib 12 is shown as being formed near the lower end of the inner sleeve 11. In addition, the rib 12 may also be provided at other locations of the inner sleeve 11, as long as the outer sleeve 21 cooperates with the rib 12 when the ram 10 is at or near its upper dead center.
[0066] The vertical surface 13 may be provided in the rib 12 or on the inner surface of the outer sleeve 21. Alternatively, other structures and shapes may be formed in the rib 12 as a substitute for the vertical surface 13. For example, a tapered shape may be formed on the outer surface of the rib 12, such as an inclined surface or a curved surface as a whole, and the outer diameter of a predetermined length of the inclined surface or the curved surface along the axial direction is greater than the inner diameter of the outer sleeve 21, and the predetermined length is greater than the axial length of the contact portion between the outer sleeve 21 and the rib 12.
[0067] For another example, the inclined surface 14 can be replaced by a curved surface. Alternatively, the transition surface between the rib 12 and the rest of the inner sleeve 11 can be a combination of an inclined surface and a curved surface.
Claims
1. An all-plastic compression pump, comprising a movable part, a fixed part and an elastic reset mechanism, wherein the movable part can reciprocate along the axial direction of the all-plastic compression pump relative to the fixed part, the elastic reset mechanism is made of plastic material and supported between the movable part and the fixed part, the movable part comprises a pressure head, an inner sleeve is formed below the pressure head, the fixed part comprises a toothed sleeve, an outer sleeve is formed on the upper part of the toothed sleeve, the inner sleeve can be fitted into the outer sleeve, and is characterized in that: A convex rib is formed on the inner sleeve, the outer diameter of the convex rib is larger than the inner diameter of the outer sleeve, and is also larger than the outer diameter of other parts of the inner sleeve except the convex rib, and the convex rib is arranged to form a sealing fit between the inner surface of the outer sleeve of the braces and the outer surface of the convex rib when the pressure head is reset to the upper dead point of the stroke and when the pressure head is not completely reset to the upper dead point of the stroke.
2. The all-plastic press pump according to claim 1, characterized in that: The convex rib is formed at the lower end of the inner sleeve.
3. The all-plastic compression pump according to claim 1, characterized in that: In the axial direction of the all-plastic press pump, the length of the convex rib is greater than the length of the contact portion between the outer sleeve and the convex rib.
4. The all-plastic compression pump according to claim 1, characterized in that: A vertical surface portion is formed on one of an outer surface of the rib and an inner surface of the outer sleeve.
5. The all-plastic compression pump according to claim 1, characterized in that: A transition portion is provided between the convex rib and other portions of the inner sleeve, and the shape of the outer surface of the transition portion is one of the following shapes: an inclined surface, a curved surface, and a combination of an inclined surface and a curved surface.
6. The all-plastic compression pump according to claim 1, characterized in that: The outer diameter of other parts of the inner sleeve except the rib is smaller than the inner diameter of the inner sleeve.
7. The all-plastic press pump according to any one of claims 1 to 6, characterized in that: The fixing part further comprises a cylinder, the cylinder is fixedly connected to the tooth sleeve, and a balancing air hole is formed on the side wall of the cylinder; The movable part further comprises a piston rod, one end of which is connected to the pressure head, and the other end of which is provided with a piston which extends into the cylinder, and the outer ring of the piston is in sealing cooperation with the inner surface of the cylinder; Wherein, the outer ring of the piston includes an upper sealing ring and a lower sealing ring, and the position of the balancing air hole is set so that when the pressure head is reset to the upper dead center of the stroke and when the pressure head is not completely reset to the upper dead center of the stroke, the balancing air hole is located between the upper sealing ring and the lower sealing ring.
8. The all-plastic compression pump according to claim 7, characterized in that: The position of the balancing air hole is arranged so that, when the pressure head is reset to the upper dead center of the stroke, the distance between the balancing air hole and the lower sealing ring is smaller than the distance between the balancing air hole and the upper sealing ring.